Which 85mm?

1. Sigma 85mm f/1.4 ($900)
2. Zeiss 85mm f/1.4 ($1700)
3. Sony 85mm f/2.8 ($300)
4. Vivitar 85mm f/1.4 ($300)
5. Bower/Samyang/Rokinon 85mm f/1.4 ($300)
6. Used Minolta 85mm f/1.4 ($700)

Portrait lens. Photos of relatives, kids playing, etc. Also, I'd like to own one really good lens -- right now, I've got a pile of pretty good ones, but nothing spectacular.

AF seems important for kids, so that discounts Vivitar, Bower, and friends.

I'm thinking Sigma? It appears to focus faster and have less CA than the Zeiss. CA bugs me. Zeiss has better corners. Bad corners bug me. Overall, it's a tossup, and the Sigma is half the price.

Minolta 85mm is likely to have bad flare. Sony f/2.8 might be a good choice, or it might be a bit slow; I'm not really sure.

Thoughts?